Path Traversal in Browserstack Browserstack-Runner
CVE-2026-49144
BrowserStack Runner through 0.9.5 contains a path traversal vulnerability in the _default HTTP handler in lib/server.js that allows unauthenticated network-adjacent attackers to read arbitrary files. Attackers can exploit the unauthenticated HTTP server bound on all interfaces to traverse outside the project root and access sensitive files.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (21.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Browserstack Browserstack-Runner — versions 0
Weakness classification (CWE)
References
- github.com/browserstack/browserstack-runner/security/advisories/GHSA-8rpw-6cqh-… (vendor-advisory)
- www.vulncheck.com/advisories/browserstack-runner-path-traversal-via-default-htt… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-49144?
- CVE-2026-49144 is a medium-severity vulnerability in Browserstack Browserstack-Runner, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-06-02.
- How severe is CVE-2026-49144?
- Medium severity. CVSS v3 base score is 6.5 out of 10.